Generally, it is necessary to have a valid passport if you want to travel abroad. Depending on the country and your citizenship, you may also need to show proof of a valid eVisa, online visa, or visa.
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A travel document is a form of identification that governments give to citizens or visitors so they can cross international borders. The U.S. government issues many different types of travel documents. The type of travel document you need depends on your immigration status and the purpose of your trip.
In terms of travel without a green card, a lawful permanent resident can travel outside of the United States without a Green Card. Still, they must present other documents, such as a valid passport from their home country and a reentry permit from the United States Citizenship and Immigration Services (USCIS).